Fig. 



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3. 



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4. 



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5. 



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6. 



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7. 



Fig. 



8. 



Fig. 



9. 



Fig. 



10. 



Fig. 



11. 



Fig. 



12. 



Fig. 



13. 



Fig. 



14. 



Fig. 



15. 



Fig. 



1'.. 



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17. 



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IS. 



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19. 



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Fig. 



21. 



Fig. 



22. 



Fig. 



23. 



1 , r. 



24. 



Fig. 



J 5. 



ILLUSTRATIONS 



Page 



Minnesota Seed Case, Series II 7 



Crab grass 8 



Witch grass 10 



Barnyard grass 12 



Darnel 13 



Pennsylvania smartweed 14 



Wild buckwheat 16 



Night-flowering catchfly 18 



i low c< >ckle 20 



Purslane 21 



False flax 22 



Black mustard 24 



Five-finger 26 



Wild rose 28 



Mallow 29 



Evening primrose 30 



Dodder 32 



Sticktight 34 



I Hue vervain 35 



( at nip 36 



Buckhorn plantain ^>S 



Marsh elder 40 



Mayweed 41 



Prickl) lettuce 42 



Perennial sow thistle 44 



